Method for Establishing Fast Feedback Channel and Transmitting Information in a Wireless Communication System

ABSTRACT

A method of transmitting information in a wireless communication system is disclosed. More specifically, the method includes a base station (BS) which receives data from a mobile subscriber station (MSS) via an uplink channel. Using the antennas) received data, the BS determines quality of the uplink channel. Thereafter, the BS transmits feedback information to the MSS. Here, the feedback information is based on the determined quality of the uplink channel.

TECHNICAL FIELD

The present invention relates to a method of establishing feedbackchannel and transmitting information, and more particularly, to a methodof establishing fast feedback channel and transmitting information in awireless communication system having multiple antennas.

BACKGROUND ART

In an Orthogonal Frequency Division Multiplexing/Orthogonal FrequencyDivision Multiplexing Access (OFDM/OFDMA) system, a base station (BS),which supports a plurality of antennas, can attain transmissiondiversity gain by receiving feedback information from a mobilesubscriber station (MSS). The feedback information includes weightvalue(s) or channel information. Here, the feedback information istransmitted from the MSS to the BS via an uplink transmission high speed(or fast) feedback channel.

In detail, the feedback information relates to various determined (ormeasured) information of the BS transmission signals. The feedbackinformation provides necessary information for the BS to transmit moreaccurate transmission signals. Here, the determined information caninclude various determined value(s) of downlink transmission signals.For example, the determined value of the downlink signal can be asignal/noise (S/N) value or a weight or selected mode value (space-timetransmit diversity or spatial multiplexing) in case of multi-inputmulti-output (MIMO).

FIG. 1 illustrates an example of a MSS sending to a BS feedbackinformation, which includes weight values (or channel information),acquired in a downlink transmission. As illustrated in FIG. 1, the BS,which uses a plurality of antennas, informs the MSS of a space-timecoding (STC) mode via a STC zone IE message. The STC mode is determinedbased on a number of antennas possessed by the BS. At the same time, theBS notifies the MSS which matrix type (e.g., type B) the BS plans touse. The multi-input multi-output (MIMO) downlink (DL) basic IE messageis the avenue through which the BS notifies the MSS of which matrix typeit plans to use. Furthermore, the BS notifies to the MSS via a ChannelQuality Indicator Channel (CQICH) Enhanced Allocation IE message themapping scheme of the weight value to be assigned to the uplink highspeed feedback channel.

On the other hand, the MSS determines the downlink channel quality oracquires a weight matrix W based on the downlink channel qualitydetermination. The size of the weight matrix is determined by the numberof BS transmission antennas and the number of output signals accordingto the STC scheme. The following Equation 1 is an example of the weightmatrix W in connection with four BS transmission antennas and two STCoutputs.

$\begin{matrix}{W = \begin{bmatrix}w_{11} & w_{12} \\w_{21} & w_{22} \\w_{31} & w_{32} \\w_{41} & w_{42}\end{bmatrix}} & \lbrack {{Equation}\mspace{14mu} 1} \rbrack\end{matrix}$

The MSS sends feedback of the weight matrix W and the channel qualityinformation acquired through Equation 1 via the CQICH (S12). In order toimprove the signal-to-noise ratio (SNR) in the receiving end by the BS,which uses a plurality of transmission antennas, the BS receives adownlink determined value or a weight value. At the same time, the BSallocates the uplink CQICH to the MSS in order to receive the downlinkdetermined value or weight value.

Additionally, in the existing 802.16 OFDMA system, a message of the fastfeedback channel of the uplink is allocated to an uplink slot. Here, anuplink slot indicates one sub-channel zone, which encompasses threesymbols, and is comprised of six tiles. A slot of IEEE 802.16 OFDMAsystem refers to the smallest unit available for data allocation and canbe expressed in time domain and sub-channel domain. Moreover, a tilecomprises eight data sub-carriers.

Table 1 provided below shows a method by which sub-carriers of a fastfeedback channel are modulated. Moreover, Table 2 shows sub-carriermodulation method as applied to each vector of Table 1.

TABLE 1 Vector indices to be used by 4 bit fast feedback channel pertile payload (tile 0, tile 1 . . . tile 5) 0b0000 0, 0, 0, 0, 0, 00b0001 1, 1, 1, 1, 1, 1 0b0010 2, 2, 2, 2, 2, 2 0b0011 3, 3, 3, 3, 3, 30b0100 4, 4, 4, 4, 4, 4 0b0101 5, 5, 5, 5, 5, 5 0b0110 6, 6, 6, 6, 6, 60b0111 7, 7, 7, 7, 7, 7 0b1000 0, 1, 2, 3, 4, 5 0b1001 1, 2, 3, 4, 5, 60b1010 2, 3, 4, 5, 6, 7 0b1011 3, 4, 5, 6, 7, 0 0b1100 4, 5, 6, 7, 0, 10b1101 5, 6, 7, 0, 1, 2 0b1110 6, 7, 0, 1, 2, 3 0b1111 7, 0, 1, 2, 3, 4

TABLE 2 Data sub-carrier modulation method per each vector index Vector(sub-carrier 0, sub-carrier 1 . . . Index sub-carrier 7) 0 P0, P1, P2,P3, P0, P1, P2, P3 1 P0, P3, P2, P1, P0, P3, P2, P1 2 P0, P0, P1, P1,P2, P2, P3, P3 3 P0, P0, P3, P3, P2, P2, P1, P1 4 P0, P0, P0, P0, P0,P0, P0, P0 5 P0, P2, P0, P2, P0, P2, P0, P2 6 P0, P2, P0, P2, P2, P0,P2, P0 7 P0, P2, P2, P0, P2, P0, P0, P2

As shown in Table 1 and Table 2, the feedback information is expressedas payload in four (4) bits, and based the payload value, vector indicesof six (6) tiles to be used in the fast feedback channel can beattained. Furthermore, eight (8) sub-carriers are provided withdifferent modulation values based on each vector index.

-   -   The following are equations regarding each modulation scheme        (P0, P1, P2, P3) with respect to Table 2.

${P\; 0} = {\frac{1}{\sqrt{2}} \cdot {\exp ( {j \cdot \frac{\pi}{4}} )}}$${P\; 1} = {\frac{1}{\sqrt{2}} \cdot {\exp ( {j \cdot \frac{3\; \pi}{4}} )}}$${P\; 2} = {\frac{1}{\sqrt{2}} \cdot {\exp ( {{- j} \cdot \frac{3\pi}{4}} )}}$${P\; 3} = {\frac{1}{\sqrt{2}} \cdot {\exp ( {{- j} \cdot \frac{\pi}{4}} )}}$

The MSS using a plurality of antennas has to receive feedbackinformation from the BS in order to achieve transmission diversity. Thefeedback information includes the uplink determined value (channelinformation or weight value). However, there is not a defined channelwhich allows for fast feedback of the BS determined value to the MSS.

DISCLOSURE OF INVENTION

Accordingly, the present invention is directed to a [title] thatsubstantially obviates one or more problems due to limitations anddisadvantages of the related art.

An object of the present invention is to provide a method oftransmitting information in a wireless communication system.

Another object of the present invention is to provide a method ofreceiving information in a wireless communication system.

A further object of the present invention is to provide a wirelesscommunication system for transmitting information.

Another object of the present invention is to provide a method ofestablishing a fast feedback channel and transmitting informationthereto.

Another object of the present invention is to provide a method ofreceiving transmitted information through an established fast feedbackchannel.

Additional advantages, objects, and features of the invention will beset forth in part in the description which follows and in part willbecome apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of theinvention. The objectives and other advantages of the invention may berealized and attained by the structure particularly pointed out in thewritten description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with thepurpose of the invention, as embodied and broadly described herein, amethod of transmitting information in a wireless communication systemwhich includes a base station (BS) which receives data from a mobilesubscriber station (MSS) via an uplink channel. Using the received data,the BS determines quality of the uplink channel. Thereafter, the BStransmits feedback information to the MSS. Here, the feedbackinformation is based on the determined quality of the uplink channel.

In another aspect of the present invention, a method of transmittinginformation in a wireless communication system which includes a basestation (BS) which allocates a physical resource for a downlink fastfeedback channel. Here, the physical resource for the downlink fastfeedback channel is different from a physical resource for a datachannel. Furthermore, the BS establishes a modulation pattern, whichcorresponds to feedback information, to the downlink fast feedbackchannel by the BS. In addition, the BS transmits the modulation pattern,which corresponds to feedback information, to a mobile subscriberstation (MSS) so that the MSS can determine which feedback informationis transmitted from the BS via the modulation pattern.

In another aspect of the present invention, a method of receivinginformation in a wireless communication system which includes a mobilesubscriber station (MSS) which transmits data to a base station (BS) viaan uplink channel. Thereafter, the MSS receives feedback informationfrom the MSS. Here, the feedback information is based on quality of theuplink channel, and the quality of the uplink channel is determinedbased on the transmitted data. In another aspect of the presentinvention, a method of receiving information in a wireless communicationsystem which includes a mobile subscriber station (MSS) which receivesand detects a modulation pattern transmitted from a base station (BS).Here, the modulation pattern is established to a downlink fast feedbackchannel, and importantly, the modulation pattern corresponds to feedbackinformation. Furthermore, the MSS determines which feedback informationis transmitted from the BS via the modulation pattern. After determiningwhich feedback information is transmitted from the BS, the MSS transmitsuplink data which is configured by using the feedback information.

It is to be understood that both the foregoing general description andthe following detailed description of the present invention areexemplary and explanatory and are intended to provide furtherexplanation of the invention as claimed.

BRIEF DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the invention andtogether with the description serve to explain the principle of theinvention. In the drawings;

FIG. 1 illustrates an example of a mobile subscriber station sending toa base station feedback information, which includes weight values (orchannel information), acquired in a downlink transmission;

FIG. 2 illustrates an example of the BS sending feedback information,which includes the result of uplink channel quality assessment, to theMSS in the OFDM/OFDMA system according to an embodiment of the presentinvention;

FIG. 3 illustrates an example of setting a determined uplink value to aspecified physical resource of a fast feedback channel;

FIG. 4 illustrates an example of a format of an IE message of a downlinkhigh speed feedback channel using an extended DIUC; and

FIG. 5 illustrates an example of a format of an IE message of a downlinkhigh speed feedback channel using an OFDMA DIUC value;

FIG. 6 is an example of a format illustrating the CQICH DL location IEmessage which includes the weight value and channel information of theBS;

FIG. 7 is an example of a structure of a wireless communication systemillustrating an operation of transmitting/receiving information betweenthe BS and the MSS.

FIG. 8 illustrates an example of a basic allocation unit of a fastfeedback channel in a downlink Partial Usage of Sub-Channels (PUSC)mode;

FIG. 9 illustrates an example of a basic allocation unit of a fastfeedback channel in a downlink Full Usage of Sub-Channels (FUSC) mode;

FIG. 10 illustrates an example of a composition of data sub-carriers;and

FIG. 11 illustrates an example of a composition of data sub-carriers.

BEST MODE FOR CARRYING OUT THE INVENTION

Reference will now be made in detail to the preferred embodiments of thepresent invention, examples of which are illustrated in the accompanyingdrawings. Wherever possible, the same reference numbers will be usedthroughout the drawings to refer to the same or like parts. Theembodiments of the present invention can apply to an OrthogonalFrequency Division Multiplexing/Orthogonal Frequency DivisionMultiplexing Access (OFDM/OFDMA) system and also can be applied to otherstandards wireless communication system. Examples related to theembodiments of the present invention are provided below.

In an embodiment of the present invention, a base station (BS) sendsfeedback information to a mobile subscriber station (MSS) via a fast (orhigh speed) downlink feedback channel. The feedback information includesa channel quality information (CQI) and weight value(s) received throughuplink channel(s). In operation, the BS informs the MSS of the fastdownlink feedback channel through which data is transmitted. Thereafter,the BS establishes the CQI or weight value to the fast downlink feedbackchannel and transmits the information to the MSS.

Preferably, the notification of the fast downlink feedback channel tothe MSS is carried out via a DIUC message or a downlink (DL) fastfeedback channel IE message. Here, the CQI or the weight values aretransmitted via the CQI Channel (CQICH) DL location IE message.

FIG. 2 illustrates an example of the BS sending feedback information,which includes the result of uplink channel quality assessment, to theMSS in the OFDM/OFDMA system according to the embodiment of the presentinvention. In FIG. 2, as explained above, the BS assigns the STC mode tothe MSS based the number of BS transmission antennas via the STC zone IEmessage. At the same time, the MSS acquires weight matrix(W=N_(t)×M_(t)). The weight matrix is derived based on the number of BStransmission antennas and the number of output signals from the STCscheme. Moreover, the BS allocates the uplink high speed feedbackchannel, also referred to as the CQICH, to the MSS.

Subsequently, the MSS notifies of the weight matrix (W=N_(t)×M_(t)) tothe BS via the allocated CQICH, and the BS, as a result is able toattain transmission diversity gain by receiving from the MSS the weightvalue for each channel. However, in order for the MSS, which usesmultiple antennas, to achieve transmission diversity gain, the MSS hasto receive feedback information on uplink channel quality value (channelinformation or weight value) from the BS. In other words, after thesteps (S10-S13) are performed and the BS receives the downlink channelquality assessed value (channel information or weight value) from theMSS, the BS transmits feedback information concerning the uplink channelquality assessed value (channel information or weight value) to the MSS.

Furthermore, the BS uses the DIUC or the DL fast feedback channel IEmessage to notify the MSS of the high speed downlink feedback channel(S14). As illustrated in FIG. 3, the BS transmits the uplink channelquality assessed value (channel information or weight value) to the MSSon an assigned specific location (or space) of the high speed downlinkfeedback channel (S15).

FIG. 4 and FIG. 5 illustrate examples of a format of an IE message forthe BS notifying the MSS of the high speed downlink feedback channel.Here, FIG. 4 is an example using an extended DIUC, and FIG. 5 is anexample using OFDMA DIUC value.

Furthermore, FIG. 6 is an example of a format illustrating the CQICH DLlocation IE message which includes the weight value and channelinformation of the BS. Here, each CQICH location IE occupies onedownlink (DL) slot, and as illustrated in FIG. 3, the DIUC=14 or the DLfast feedback channel IE is assigned to the high speed downlink feedbackchannel.

FIG. 7 is an example of a structure of a wireless communication systemillustrating an operation of transmitting/receiving information betweenthe BS and the MSS. More specifically, the BS receives via the receiver21 data from the MSS via an uplink channel to determine the quality ofthe uplink channel by the controller 20. The BS can receive data as wellas other types of data and information through which channel statusand/or quality can be determined, for example. The BS can then use thetransmitter 22 to transmit feedback information to the MSS. Here, thefeedback information is based on the determined quality of the uplinkchannel.

In order for communication to take place, the MSS transmits data firstto the BS via the transmitter 14. After the controller 20 of the BSdetermines the quality of the uplink channel and transmits via thetransmitter 22, the receiver 13 of the MSS receives the feedbackinformation from the BS.

Another embodiment of the present invention relates to allocating aphysical channel space to provide fast feedback channel in a downlinkdirection and defining a sub-carrier modulation method for the feedbackchannel so that the BS can send feedback information, including channelquality information and weight value(s), received in the uplinktransmission, to the MSS via a defined feedback channel.

FIG. 8 is an example illustrating a basic allocation unit of a fastfeedback channel in a downlink Partial Usage of Sub-Channels (PUSC)mode. FIG. 9 is an example illustrating a basic allocation unit of afast feedback channel in a downlink Full Usage of Sub-Channels (FUSC)mode. In IEEE 802.26 OFDMA system, the downlink frame fundamentallyprovides the PUSC and FUSC modes. The PUSC mode provides a permutationscheme whereby only partial sub-channels are used in transmitting data.As illustrated in FIG. 8, a slot of the PUSC mode signifies asub-channel comprised of two symbols and of four clusters. Furthermore,each cluster has 12 data sub-carriers.

The FUSC mode provides a permutation scheme whereby full or allsub-channels are used in transmitting data. As illustrated in FIG. 9, aslot of the FUSC mode signifies a sub-channel comprising one symbol and48 data sub-carriers, as in the PUSC mode. Furthermore, both in the PUSCmode and the FUSC mode, each slot possesses 48 data sub-carriers.

In the present embodiment, as is the case in the fast feedback channelin the downlink direction, one slot is allocated to the fast feedbackchannel in downlink direction. In other words, the slot indicated inFIGS. 1 and 2 can be expressed as the basic allocation unit of thephysical channel space of the fast feedback channel. Because the PUSCmode and the FUSC mode each include 48 data sub-carriers, the samemodulation method can be applied despite the differences in shapes ofthe two modes. FIG. 10 and FIG. 11 are example illustrating acomposition of data sub-carriers. In FIGS. 10 and 11, 48 datasub-carriers can be divided into six small groups. Furthermore, eachsmall group includes eight sub-carriers. With this arrangement, thedownlink fast feedback channel can apply the composition of the uplinkfast feedback channel. Table 3 illustrates a sub-carrier modulationmethod of a feedback channel according to the embodiment of the presentinvention.

TABLE 3 Vector indices to be used by fast feedback channel per smallgroup 4 bit (small group 0, small group 1 . . . payload small group 5)0b0000 0, 0, 0, 0, 0, 0 0b0001 1, 1, 1, 1, 1, 1 0b0010 2, 2, 2, 2, 2, 20b0011 3, 3, 3, 3, 3, 3 0b0100 4, 4, 4, 4, 4, 4 0b0101 5, 5, 5, 5, 5, 50b0110 6, 6, 6, 6, 6, 6 0b0111 7, 7, 7, 7, 7, 7 0b1000 0, 1, 2, 3, 4, 50b1001 1, 2, 3, 4, 5, 6 0b1010 2, 3, 4, 5, 6, 7 0b1011 3, 4, 5, 6, 7, 00b1100 4, 5, 6, 7, 0, 1 0b1101 5, 6, 7, 0, 1, 2 0b1110 6, 7, 0, 1, 2, 30b1111 7, 0, 1, 2, 3, 4

In Table 3, the order combination(s) of vector indices according topayload and the small groups (0-5) can be changed. Table 4 of belowshows data sub-carrier modulation method for each vector of Table 3.

TABLE 4 Data sub-carrier modulation technique per each vector indexVector (sub-carrier 0, sub-carrier 1 . . . Index sub-carrier 7) 0 P0,P1, P2, P3, P0, P1, P2, P3 1 P0, P3, P2, P1, P0, P3, P2, P1 2 P0, P0,P1, P1, P2, P2, P3, P3 3 P0, P0, P3, P3, P2, P2, P1, P1 4 P0, P0, P0,P0, P0, P0, P0, P0 5 P0, P2, P0, P2, P0, P2, P0, P2 6 P0, P2, P0, P2,P2, P0, P2, P0 7 P0, P2, P2, P0, P2, P0, P0, P2

The fast feedback channel modulation according to the embodiment of thepresent invention can use various modulation techniques such as BinaryPhase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and 16Quadrature Amplitude Modulation (16 QAM). Each modulation techniques(P0, P1, P2, P3) of Table 4 shows an example of the QPSK techniqueapplied to the OFDM/OFDMA system. Furthermore, the modulation ordercombination(s) according to each vector index in Table 4 may vary.

To describe another operation of transmitting/receiving informationbetween the BS and the MSS in a wireless communication system fortransmitting information, the structure of FIG. 7 will be used, alongwith the number labels, to explain the operation. In operation, acontroller 20 of the BS allocates a physical resource for a downlinkfast feedback channel and establishes a modulation pattern to thedownlink fast feedback channel by the BS. Here, the physical resourcefor the downlink fast feedback channel is different from a physicalresource for a data channel, and also, the modulation patterncorresponds to feedback information. Thereafter, the transmitter 22 ofthe BS transmits the modulation pattern to the MSS.

At the MSS, a receiver 13 receives the modulation pattern transmittedfrom a base station (BS). Here, the modulation pattern was establishedto the downlink fast feedback channel at the controller 20 of the BS,and the modulation pattern corresponds to feedback information. Uponreceipt, a controller 10 of the MSS detects the modulation patterntransmitted from the BS and determines which feedback information istransmitted from the BS via the modulation pattern. After determiningthe feedback information, a transmitter 14 of the MSS transmits anuplink data, which has been configured by using the feedbackinformation, to the BS.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present inventionwithout departing from the spirit or scope of the inventions. Thus, itis intended that the present invention covers the modifications andvariations of this invention provided they come within the scope of theappended claims and their equivalents.

1. A method of transmitting information in a wireless communicationsystem, the method comprising: receiving data from a mobile subscriberstation (MSS) via an uplink channel; determining quality of the uplinkchannel based on the received data by a base station (BS); andtransmitting a feedback information to the MSS, wherein the feedbackinformation is based on the determined quality of the uplink channel. 2.The method of claim 1, wherein the feedback information includes channelquality information (CQI) of an uplink channel.
 3. The method of claim1, wherein the feedback information includes weight values.
 4. Themethod of claim 1, wherein the feedback information includes acombination of channel quality information (CQI) and weight values. 5.The method of claim 1, wherein the feedback information is transmittedvia a downlink fast feedback channel.
 6. The method of claim 1, whereinthe feedback information is transmitted via a data burst.
 7. The methodof claim 1, wherein the feedback information is transmitted via a MediumAccess Channel (MAC) message.
 8. A method of receiving information in awireless communication system, the method comprising: transmitting datato a base station (BS) via an uplink channel; and receiving a feedbackinformation from the BS, wherein the feedback information is based onquality of the uplink channel, and wherein the quality of the uplinkchannel is determined based on the transmitted data.
 9. The method ofclaim 8, wherein the feedback information includes channel qualityinformation (CQI) of an uplink channel.
 10. The method of claim 8,wherein the feedback information includes weight values.
 11. The methodof claim 8, wherein the feedback information includes a combination ofchannel quality information (CQI) and weight values.
 12. The method ofclaim 8, wherein the feedback information is transmitted via a downlinkfast feedback channel.
 13. The method of claim 8, wherein the feedbackinformation is transmitted via a data burst.
 14. The method of claim 8,wherein the feedback information is transmitted via a Medium AccessChannel (MAC) message.
 15. A method of transmitting and receivinginformation in a wireless communication system, the method comprising:transmitting data to a base station (BS) by a mobile subscriber station(MSS) via an uplink channel; receiving the transmitted data from the MSSvia the uplink channel; determining quality of the uplink channel basedon the received data by the BS; transmitting a feedback information tothe MSS by the BS, wherein the feedback information is based on thedetermined quality of the uplink channel; and receiving the transmittedfeedback information from the BS.
 16. The method of claim 15, whereinthe feedback information includes channel quality information (CQI) ofan uplink channel.
 17. The method of claim 15, wherein the feedbackinformation includes weight values.
 18. The method of claim 15, whereinthe feedback information includes a combination of channel qualityinformation (CQI) and weight values.
 19. The method of claim 15, whereinthe feedback information is transmitted via a downlink fast feedbackchannel.
 20. The method of claim 15, wherein the feedback information istransmitted via a data burst.
 21. The method of claim 15, wherein thefeedback information is transmitted via a Medium Access Channel (MAC)message.
 22. A wireless communication system for transmittinginformation, the system comprising a base station (BS) which includes: areceiver for receiving data from a mobile communication station (MSS)via an uplink channel; a controller for determining quality of theuplink channel based on the received data by the BS; and a transmitterfor transmitting a feedback information to the MSS, wherein the feedbackinformation is based on the determined quality of the uplink channel.23. A wireless communication system for receiving information, thesystem comprising a mobile communication station (MSS) which includes: atransmitter for transmitting data to a base station (BS) via an uplinkchannel; and a receiver for receiving a feedback information from theBS, wherein the feedback information is based on quality of the uplinkchannel, and wherein the quality of the uplink channel is determinedbased on the transmitted data.
 24. A method of transmitting informationin a wireless communication system, the method comprising: allocating aphysical resource for a downlink fast feedback channel by a base station(BS), wherein the physical resource for the downlink fast feedbackchannel is different from a physical resource for a data channel;establishing a modulation pattern to the downlink fast feedback channelby the BS, wherein the modulation pattern corresponds to feedbackinformation; and transmitting the modulation pattern to a mobilesubscriber station (MSS).
 25. The method of claim 24, further comprisingreceiving uplink data from the MSS, wherein the uplink data isconfigured by using feedback information.
 26. The method of claim 24,wherein the modulation pattern consists of sub-carriers.
 27. The methodof claim 24, wherein a location of the downlink fast feedback channel isnotified to the MSS by the BS.
 28. The method of claim 24, wherein asize of the downlink fast feedback channel is notified to the MSS by theBS.
 29. The method of claim 24, wherein the modulation patterns haveorthogonal relationships with each other.
 30. The method of claim 24,wherein the feedback information includes channel quality information(CQI).
 31. The method of claim 24, wherein the feedback informationincludes weight values.
 32. The method of claim 24, wherein the feedbackinformation includes a combination of channel quality information (CQI)and weight values.
 33. A method of receiving information in a wirelesscommunication system, the method comprising: receiving and detecting amodulation pattern transmitted from a base station (BS), wherein themodulation pattern is established to a downlink fast feedback channeland wherein the modulation pattern corresponds to feedback information;determining which feedback information is transmitted from the BS viathe modulation pattern; and transmitting uplink data, wherein the uplinkdata is configured by using the feedback information.
 34. The method ofclaim 33, wherein the feedback information includes channel qualityinformation (CQI).
 35. The method of claim 33, wherein the feedbackinformation includes weight values.
 36. The method of claim 33, whereinthe feedback information includes a combination of channel qualityinformation (CQI) and weight values.
 37. A method of transmitting andreceiving information in a wireless communication system, the methodcomprising: allocating a physical resource for a downlink fast feedbackchannel by a base station (BS), wherein the physical resource for thedownlink fast feedback channel is different from a physical resource fora data channel; establishing a modulation pattern to the downlink fastfeedback channel by the BS, wherein the modulation pattern correspondsto feedback information; transmitting the modulation pattern to a mobilesubscriber station (MSS); receiving and detecting a modulation patterntransmitted from a base station (BS), wherein the modulation pattern isestablished to a downlink fast feedback channel and wherein themodulation pattern corresponds to feedback information; determiningwhich feedback information is transmitted from the BS via the modulationpattern; and transmitting uplink data, wherein the uplink data isconfigured by using the feedback information.
 38. The method of claim37, wherein the modulation pattern consists of sub-carriers.
 39. Themethod of claim 37, wherein a location of the downlink fast feedbackchannel is notified to the MSS by the BS.
 40. The method of claim 37,wherein a size of the downlink fast feedback channel is notified to theMSS by the BS.
 41. The method of claim 37, wherein the modulationpatterns have orthogonal relationships with each other.
 42. The methodof claim 37, wherein the feedback information includes channel qualityinformation (CQI).
 43. The method of claim 37, wherein the feedbackinformation includes weight values.
 44. The method of claim 37, whereinthe feedback information includes a combination of channel qualityinformation (CQI) and weight values.
 45. A wireless communication systemfor transmitting information, the system comprising a base station (BS)which includes: a controller for allocating a physical resource for adownlink fast feedback channel by a base station (BS) and establishing amodulation pattern to the downlink fast feedback channel by the BS,wherein the physical resource for the downlink fast feedback channel isdifferent from a physical resource for a data channel, and wherein themodulation pattern corresponds to feedback information; and atransmitter for transmitting the modulation pattern to a mobilesubscriber station (MSS).
 46. A wireless communication system forreceiving information, the system comprising a mobile subscriber station(MSS) which includes: a receiver for receiving a modulation patterntransmitted from a base station (BS), wherein the modulation pattern isestablished to a downlink fast feedback channel and wherein themodulation pattern corresponds to feedback information; a controller fordetecting the modulation pattern transmitted from the BS and determiningwhich feedback information is transmitted from the BS via the modulationpattern; and a transmitter for transmitting uplink data, wherein theuplink data is configured by using the feedback information.